src/org/mxchange/jcustomercore/utils/Customers.java

   1 /*
   2  * Copyright (C) 2016 - 2018 Free Software Foundation
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.jcustomercore.utils;
  18
  19 import java.security.SecureRandom;
  20 import java.text.MessageFormat;
  21 import java.util.Random;
  22 import org.apache.commons.lang3.StringUtils;
  23 import org.mxchange.jcustomercore.model.customer.Customer;
  24
  25 /**
  26  * Customer utilities
  27  * <p>
  28  * @author Roland Häder<roland@mxchange.org>
  29  */
  30 public class Customers {
  31
  32         /**
  33          * Random number generator
  34          */
  35         private static final Random RANDOM_NUMBER_GENERATOR;
  36
  37         /**
  38          * Static initializer
  39          */
  40         static {
  41                 // Init RNG
  42                 RANDOM_NUMBER_GENERATOR = new SecureRandom();
  43         }
  44
  45         /**
  46          * Copies all fields from source customer to target customer instance.
  47          * <p>
  48          * @param targetCustomer Target customer instance 1
  49          * @param sourceCustomer Source customer instance 2
  50          * <p>
  51          * @throws NullPointerException If one parameter is null
  52          */
  53         public static void copyAll (final Customer targetCustomer, final Customer sourceCustomer) {
  54                 // Check both parameter
  55                 if (null == targetCustomer) {
  56                         // Throw NPE
  57                         throw new NullPointerException("targetCustomer is null"); //NOI18N
  58                 } else if (null == sourceCustomer) {
  59                         // Throw NPE
  60                         throw new NullPointerException("sourceCustomer is null"); //NOI18N
  61                 }
  62
  63                 // Copy all fields
  64                 targetCustomer.setCustomerAccountStatus(sourceCustomer.getCustomerAccountStatus());
  65                 targetCustomer.setCustomerContact(sourceCustomer.getCustomerContact());
  66                 targetCustomer.setCustomerCreated(sourceCustomer.getCustomerCreated());
  67                 targetCustomer.setCustomerId(sourceCustomer.getCustomerId());
  68                 targetCustomer.setCustomerLastLocked(sourceCustomer.getCustomerLastLocked());
  69                 targetCustomer.setCustomerLastLockedReason(sourceCustomer.getCustomerLastLockedReason());
  70                 targetCustomer.setCustomerNumber(sourceCustomer.getCustomerNumber());
  71         }
  72
  73         /**
  74          * Generates a random customer number with some dashes in it
  75          * <p>
  76          * @param totalLength Length of the number
  77          * @param blockSize   Block size
  78          * @param separator   Separator
  79          * <p>
  80          * @return Generated customer number
  81          */
  82         public static String generateCustomerNumber (final int totalLength, final short blockSize, final char separator) {
  83                 // All parameters must be set
  84                 if (totalLength < 5) {
  85                         // Total length is to short
  86                         throw new IllegalArgumentException(MessageFormat.format("Total length of{0} characters is to short (5 minimum)", totalLength)); //NOI18N
  87                 } else if (blockSize < 3) {
  88                         // 3 charcters is minimum
  89                         throw new IllegalArgumentException(MessageFormat.format("Block size of {0} characters is to short (3 minimum)", blockSize)); //NOI18N
  90                 }
  91
  92                 // Init number
  93                 StringBuilder customerNumber = new StringBuilder(totalLength);
  94
  95                 // Calculate total blockas
  96                 long totalBlocks = Math.round(totalLength / (blockSize - 1) - 0.5) - 1;
  97
  98                 // Generate customer number
  99                 for (int i = 0; i < totalBlocks; i++) {
 100                         // Fill it up with leading zeros and append it + separator character
 101                         customerNumber.append(genrateBlock(blockSize)).append(separator);
 102                 }
 103
 104                 // Calculate remaining charcters
 105                 long remain = totalLength - (blockSize + 1) * totalBlocks;
 106
 107                 // Generate new block and append it
 108                 customerNumber.append(genrateBlock((short) remain));
 109
 110                 // Return finished number
 111                 return customerNumber.toString();
 112         }
 113
 114         /**
 115          * Generates a block of numbers with leading zeros, if the random number is
 116          * shorter than block size
 117          * <p>
 118          * @param blockSize Block size
 119          * <p>
 120          * @return Generated block
 121          */
 122         private static String genrateBlock (final short blockSize) {
 123                 // Generate random number
 124                 int num = RANDOM_NUMBER_GENERATOR.nextInt((int) Math.pow(10, blockSize));
 125
 126                 // Generate "block" and return it
 127                 return StringUtils.leftPad(String.valueOf(num), blockSize, '0');
 128         }
 129
 130         /**
 131          * No constructors for utility classes
 132          */
 133         private Customers () {
 134         }
 135
 136 }